Whipstock



H. H. MCVICAR WHIPSTOCK Filed oct. 3, 1952 Patented Aug. 21, 1934 UNITED STATES wnlrsrocx' Harold Hastings McVicar, Long Beach, Calif.,

assigner` of one-half Beach, Calif.

Application October 3,

6 Claims.

This invention relatesto a whipstock whereby a bit is deflected from a course which it had,4

previously pursued.' Heretofore, whipstockswhen placed in a well or the like-were cemented in position. The cement was allowed to set for a length of time before the bit was rerun and the drilling continued.

An object of my invention is to provide a whipstock which can be placed in a hole and securely lo held in position so that the drilling'operation can be immediately continued.

Another object of my invention is to provide a whipstock which can be removed from the well after its purpose has been accomplished.

Still another object is to provide'a whipstock of the character stated in which the guided collar can be reamed off if the whipstock is so securely held that it'cannot be removed.

Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description and the appended claims.

In the drawing Figure 1 is a side elevation of my Vwhipstock in position in a hole.

Figure 2 is an elevation taken at right angles to that shown in Figure 1.

Figure 3 is a longitudinal sectional group of the whipstock.

Referring more particularly to the drawing, my whipstock comprises a body 1. This body is preferably solid altho it may be tubular if desired. 'I'he body is provided with a tapered deecting surface 2 on one side thereof and this surface extends upwardly to the top of the body I; A sharp o r wedge point 3 is provided on the bottom of body 1 so that the whipstock can be driven or forced into the formation or bridge at the bottom of the hole. The whipstock is properly oriented while it is being run into the hole and when bottom is reached the body is driven or forced into the formation and is non-rotatably held, due to the wedge shape of the point. The weight of the drill pipe to which u the whipstock is attached is ordinarily sufficient to embed the whipstock in the formation. However, it mayl be hammered into place, if necessary, as will be subsequently described.

A ring or collar 4 is integrally formed at the top of the body 1 for the purpose of guiding the bit and also for removing the whipstock after the deflecting or by-passing operation is completed. A pipe or tube section 5 extends thru the collar 4 and the bit 6 is attached to the I6 bottom thereof. The bit is of usual and well to J ohn EaStman,` Long 1932, Serial No. 635,943

(Cl. Z-1) knownconstruction with thelexception that. the teeth are provided with reaming or cutting edges at the top so that the collar 4 can be `removed or cut olf 'if the whipstock is stuck inthe`hole.' One or more shear pins 7 engage the pipe 5 or bit 6 for the purpose of holding the 6o bit in raised position while the tool is being run into the hole. When bottom is reached, the pin or pins are suiiiciently strong to withstand the strain necessary to embed the whipstock in the formation. After the whipstock is placed,l 5 a greater strain is exerted on the shear pin which causes it to break and the drilling operation continues.

The pipe 5 and attached drill pipe 8 pass thru the collarv 4 and after a sunicient amount of 70 hole has been made so that vthe proper direction of the hole is insured, the drill pipe is elevated until the bit 6 strikes the collar. A sharp upward pull will ordinarily dislodge the Whipstock and it can be removed from the well and be used again, if desired.

With my invention there is no metal left in the hole which might cause trouble in the future and also the whipstock can be re-run a great many times. As previously stated, if, thru some unfortunate circumstances, the whipstock is stuck so securely that it could not be removed, then rotation of the bit 6 against the collar 4 will sever the collar and the body of the whipstock remains in the hole.

Having described my invention, I claim:

1. A whipstock comprising a body, said body being pointed at the bottom thereof, whereby it may be embedded in the formation, a collar at the upper end of said body, a tapered surface on said body, said surface extending below the collar and a bit slidably mounted in said collar, said bit being greater in diameter than the collar, the bit engaging the collar on upward movement thereof, whereby'the bit and the body arev 95 simultaneously removed from the well.

2. A whipstock comprising a body, said body being pointed at the bottom thereof, whereby it may be embedded in the formation, a collar at the upper end of said body, a tapered surface on 100 said body, said surface extending below the collar and a bit mounted for slidable movement in said collar, and means releasably holding said bit adjacent said collar, said bit being of greater diameter than the collar, whereby upon release of said holding means, the bit is adapted to engage the collar to permit the simultaneous removal of the bit and body from the Well.

3. A whipstock comprising a body, a wedge no 4. A whipstock comprising a body, a wedgeV point on the bottom of said body, a tapered surface on the side of said body, a collar at the top of said body, a pipe section extending thru said collar and a bit secured to the bottom of said pipe section, said bit being positioned below said collar, said bit being greater in diameter than the collar, and a shear pin in the collar engaging the pipe section to retain the bitin an inoperative position during the lowering of the body into the well, the pin being sheared upon the setting of the body in the well, whereby *Y the bit may be moved upwardly into engagement with the collar to permit the siimtaneo romoval of the bit and body from the well.

5. A whipstock comprising a body. said body being pointed at the bottom thereof whereby it may be embedded in the formation, a collar at the upper end of said body, a tapered' surface on said body below the collar, a bit Yslidably mounted in said collar, said bit engaging the collar on upyard movement thereof whereby the `whipstock is-removed from the well, said bit being adapted and arranged to sever the collar if the whipstock is stuck in the well.

6. A whipstock comprising a body, said body being-pointed at the bottom thereof whereby it may be imbedded in the formation, a tapered surface on said body, a bit, mounting means on the body for said bit whereby the bit is slidable on said tapered surface, and said means o n the body engageable by the bit on upward movement thereof, whereby the body and the bit are simultaneously kremoved from the well.

HAROLD HASTINGS MCVICAR. 

